新型绿色壳聚糖-果胶凝胶珠用于从水溶液中去除 Cu(II)、Cd(II)、Hg(II) 和 Pb(II)。
Novel green chitosan-pectin gel beads for the removal of Cu(II), Cd(II), Hg(II) and Pb(II) from aqueous solution.
机构信息
College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China.
College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China.
出版信息
Int J Biol Macromol. 2021 Apr 15;176:217-225. doi: 10.1016/j.ijbiomac.2021.02.037. Epub 2021 Feb 11.
Chitosan-pectin gel beads (CPBs) were synthesized via a facile and green method and applied to remove heavy metals from aqueous solution. The structural characteristics of CPBs were investigated by SEM and FTIR, the mechanical strength of CPBs was measured by Texture Analyzer and the stability of CPBs was evaluated in acidic solution. To study the adsorption characteristics, the effect of pH, contact time, initial heavy metals concentration, temperature, adsorption mechanism and regeneration were systematically investigated. The adsorption kinetics fitted well pseudo-second-order model, and the adsorption isotherms were well described by Langmuir model. The maximum adsorption capacities of Cu(II), Cd(II), Hg(II) and Pb(II) were 169.4, 177.6, 208.5 and 266.5 mg/g, respectively. The adsorption-desorption experiments revealed that the CPBs exhibited a great reusability. Thus, the synthesized CPBs in this study had the potential to be utilized as an environment-friendly and green adsorbent for the removal of heavy metals.
壳聚糖-果胶凝胶珠（CPBs）通过一种简便、绿色的方法合成，并应用于从水溶液中去除重金属。通过 SEM 和 FTIR 研究了 CPBs 的结构特征，通过 Texture Analyzer 测量了 CPBs 的机械强度，并在酸性溶液中评估了 CPBs 的稳定性。为了研究吸附特性，系统研究了 pH 值、接触时间、初始重金属浓度、温度、吸附机制和再生的影响。吸附动力学很好地符合拟二级模型，吸附等温线很好地符合朗缪尔模型。Cu(II)、Cd(II)、Hg(II)和 Pb(II)的最大吸附容量分别为 169.4、177.6、208.5 和 266.5 mg/g。吸附-解吸实验表明，CPBs 具有很好的可重复使用性。因此，本研究中合成的 CPBs 有望作为一种环保、绿色的吸附剂，用于去除重金属。
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